COUPLING FOR REPAIRING HOT TAPPING OR JOINING PIPELINES AND A METHOD OF ISOLATING AND PRESSURE-TESTING A PORTION OF A PIPELINE

摘要

1483141 Repairing, hot tapping or joining pipe-lines PIPE LINE DEVELOPMENT CO 7 March 1975 [13 March 1974] 9651/75 Heading F2P A coupling 10 for repairing, hot tapping or joining pipe-lines has two members 11, 12 that can be clamped together. Each member has grooves 19, 20 in which seals 21, 22 fit. The seals have circumferential portions 27, 28 and longitudinal portions 23a, 24a. Strips 32, 33 are welded to the members and help to give a better circumferential seal. Thus an annular pressurizable zone 31 is formed. Pressurizing this zone with a fluid gives a test of the effectiveness of the outer of the seals.